73D2248A/2348A MNP5, V.42bis Datacom Modem Device Set

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1 DESCRIPTION FEATURES January 1999 The 3D2248A/2348A Device Sets consists of two CMOS integrated circuits which provide the data pump and protocol functions required to implement a high performance 2400 bit/s modem with error control and data compression. The 3D2248A basic modem function is provided by the 3K224L modem chip and is compatible with CCITT V.21, V.22, V.22bis and Bell 103 and 212A protocols. The error control functions are provided by modular software running in the 3M2910 controller. Modules are available for MNP4, and V.42. Compression software modules can be added to the controller; MNP and V.42bis are available. Provisions for customization of the command set are provided, forming the basis for an international modem. The 3D2348 differs from the 3D2248A in that it uses the 3K324L instead of the 3K224L for the data pump. The 3K324L replaces the Bell 103, 300 bps (bit/s) FSK mode of operation, with the CCITT V.23, 1200 bps (bit/s) FSK mode. The software is also modified to support V.23. The two products are otherwise identical. Combines modem and protocol controller Supports 0-300, 1200 and 2400 bit/s with both sync and async modes Modular software design allows customization Modem protocols: Bell 103 (3K224L), 212A CCITT V.21, V.22, V.22bis, V.23 (3K324L) Error control/compression protocols Available: MNP4, MNP, CCITT V.42, V.42bis Supports non-volatile memory to store user configurations and phone numbers CMOS design for low power consumption 3M2910L Controller 8 3K224L/324L Modem HYBRID/ DAA TSC 3D STATIC RAM 32K x 8 16 ROM 64K x 8 NV RAM 93C66 RECOMMENDED SUPPORT

2 FUNCTIONAL DESCRIPTION The 3D2248A/2348A device set forms the basis for an international modem design incorporating the most advanced error control and compression algorithms. The set consists of two chips, the 3K224L (3K324L) modem and the 3M2910 controller. Customization of the controller is one of the features of this device set; software modules allow the modem vendor to provide a range of features from a standard hardware platform. The 3K224L (3K324L) provides the QAM, PSK and FSK modulator and demodulator functions, call progress and handshake tone monitors, test modes and a tone generator capable of producing DTMF, answer and CCITT guardtones. This single-chip modem supports the V.22bis, V.22, V.21 and Bell 103/CCITT V.23/212A operating protocols in both sync and async modes. Low level functions of the controller provide for automatic detection of DTE speed, auto-dial, auto-answer, handshake with fallback and call progress detection. The 3M2910 controller handles both the low level modem functions as well as protocol negotiation and protocol operation. Software modules can be chosen to provide the desired protocols for product customization and differentiation. In addition, the AT command set source code will be available for those desiring to provide unique or country dependent features. Basic capabilities of the modem are those found in the 3K224L (3K324L) single-chip modem and are listed in the separate 3K224L (3K324L) data sheet. TEST MODES The 3D2248A/2348A device set has provisions for three test modes: analog loopback, digital loopback and remote digital loopback. Analog loopback allows data to be sent into the local modem, have it modulated and then demodulated and returned to the local terminal. Digital loopback requires the cooperation of the user at the remote end and allows data to be sent to the remote modem, demodulated, then remodulated and returned to the local end. Remote digital loopback allows the same capability, without the need for a remote operator; signals are sent to the remote modem which perform the switching task that a remote operator would have done. AT COMMAND INTERPRETER The 3D2248A/2348A includes an AT Command Interpreter which is a superset of the Hayes 2400 Smartmodem command set. Common application software will be able to control the modem though this interpreter. Additional commands have been added to provide for control of the MNP and CCITT V.42 modes. NON-VOLATILE MEMORY A serial NVRAM provides 26 bytes of storage for configuration information and telephone numbers. AUTOMATIC HANDSHAKE The 3D2248A/2348A will automatically perform a complete handshake with a called or calling modem and enter the data transfer mode. After the link between the two modems has been established, the modems may remain in the normal data mode or negotiate a link which has error control and data compression. Commands are provided to inform the modem which action is appropriate. 2

3 PROTOCOLS Microcom Networking Protocol (MNP) MNP4 is a protocol offering error control while MNP offers data compression. Data to be transmitted is broken into blocks of varying sizes, depending on line conditions, and sent to the remote modem along with a 16-bit Cyclic Redundancy Check (CRC) word. If the algorithm used to derive the CRC word at the transmitter does not produce an identical word when exercised on the received data, a line error is assumed, and the block is repeated. Data compression is obtained by transmitting a short set of characters for a longer redundant set. At the receiver, the short string is replaced with the longer string that it represented, and the data stream is returned to its original state. CCITT V.42 AND V.42BIS The CCITT has ratified a set of protocols which operate in a manner similar to MNP. MNP4 corresponds to V.42 while MNP corresponds with V.42bis. Greater efficiency is offered, but the tradeoff is a larger memory space requirement. MNP requires an 8K buffer, while V.42bis requires 32K. Data files which show compression ratios approaching 2:1 with MNP may show ratios of nearly 4:1 with V.42bis. ADDITIONAL INFORMATION The TDK Semiconductor Corporation 3D2248/2348 Design Manual defines the AT commands. Please contact your local TDK Semiconductor Corporation s sales office for a copy of the TDK Semiconductor Corporation s Protocol Design Manual. 3

4 AT COMMAND SUMMARY Command Description AT command prefix - precedes command line <CR> carriage return character - terminates command line A go into answer mode; attempt to go to on-line state A/ re-execute previous command line; not preceded by AT nor followed by <CR> B0 select CCITT V.22 and V.21standards for 1200 and 300 bit/s communications B1 select Bell 212A and Bell 103 standards for 1200 and 300 bit/s communicatios D dial number that follows; attempt to go to on-line state, originate mode DS=n dial stored number in location n (0-3) E0 Disable character echo in command state E1 Enable character echo in command state H0 go on hook (hang up) H1 go off hook; operate auxiliary relay I0 request product identification code I1 perform checksum on firmware ROM; return checksum I2 perform checksum on firmware ROM; returns OK or ERROR result codes L0 or L1 low speaker volume L2 medium speaker volume L3 high speaker volume M0 speaker off M1 speaker on until carrier detected M2 speaker always on M3 speaker on until carrier detected, except during dialing O0 go to on-line state O1 go to on-line state and initiate equalizer retrain at 2400 bit/s Q0 modem returns result codes Q1 modem does not return result codes Sr set pointer to register r Sr=n set register r to value n Sr? display value stored in register r V0 display result codes in numeric form V1 display result codes in verbose form (as words) W0 negotiation progress result codes not returned W1 negotiation progress result codes returned X0 enable features represented by result codes 0-4 Command Description X4 enable features represented by result codes 0-, Y0 disable long space disconnect Y1 enable long space disconnect Z0 reset modem &C0 assume data carrier always present &C1 track presence of data carrier &D0 ignore DTR signal &D1 assume command state when an on-to-off transition of DTR occurs &D2 hang up and assume command state when an on-to-off transition of DTR occurs &D3 reset when an on-to-off transition of DTR occurs &F recall factory settings as active configuration &G0 no guard tone &G1 0 Hz guard tone &G Hz guard tone &K flow control method &M0 asynchronous mode &M1 synchronous mode 1 &M2 synchronous mode 2 &M3 synchronous mode 3 &Q error control mode &Q6 automatic speed buffering (ASB) &T0 terminate test in progress &T1 initiate local analog loopback &T3 initiate local digital loopback &T4 grant request from remote modem for RDL &T deny request from remote modem for RDL &T6 initiate remote digital loopback &T initiate remote digital loopback with self test &T8 initiate local analog loopback with self test &V view active configuration, user profiles, and stored numbers &W0 save storable parameters of active configuration &X0 modem provides transmit clock signal &X1 data terminal provides transmit clock signal &X2 receive carrier provides transmit clock signal &Zn=x store phone number x in location n (0-3) X1 enable features represented by result codes 0-, X2 enable features represented by result codes 0-6, X3 enable features represented by result codes 0-,,

5 Dial string arguments:, = = silent answer! = flash ; = return to command s = dial stored number W = wait for tone R = reverse mode If the NOVRAM has not been initialized it may be necessary to power down/power up and type AT&F&W<cr> to properly initialize modem state. TABLE 1: Result Codes Xn VERBOSE/NUMERIC RESULT CODES X0 OK/0, CONNECT/1, RING/2, NO CARRIER/3, ERROR/4 X1 All functions of X0 + CONNECT (RATE)/1 = 300, = 1200, 10 = 2400 X2 All functions of X1 + NO DIAL TONE/6 X3 All functions of X1 + BUSY/ X4 All functions of X3 + NO DIAL TONE/6, NO ANSWER/8 TABLE 2: S Registers Supported Sn FUNCTION UNITS DEFAULT S0 1 Answer on ring No. of rings on which to answer S1 Ring counter No. of rings accumulated 000 S2 Escape code ASCII CHR Decimal S3 Carriage return ASCII CHR Decimal S4 Line feed ASCII CHR Decimal S Back space ASCII CHR 008 S6 Wait for dial tone Seconds 002 S Wait for carrier Seconds 030 S8 Pause time Seconds 002 S9 Carrier valid 100 milliseconds (0.1 sec) 006 S10 Carrier drop out 100 milliseconds (0.1 sec) 014 S11 DTMF tone duration 1 millisecond (0.001 sec) 00 S12 Escape guard time 20 milliseconds (0.0 sec) 00 S13 Unused N/A *S14 1 Bit mapped register Decimal S1 Unused N/A 1 Stored in NVRAM with &W command. 2 Modem will not answer until value is changed to 1 or greater.

6 TABLE 2: S Registers Supported (continued) Sn FUNCTION UNITS DEFAULT S16 Test register Decimal # 000 S1 Special test register Decimal S18 Test timer Decimal S19 Unused N/A S20 Unused N/A *S21 1 Bitmapped register Decimal *S22 1 Bitmapped register Decimal *S23 1 Bitmapped register Decimal S24 Unused N/A S2 1 DTR delay 10 milliseconds (0.01 sec) 00 S26 1 CTS delay 10 milliseconds (0.01 sec) 001 *S2 1 Bitmapped register Decimal S36 Negotiation failure treatment S3 Desired modem line speed Decimal S38 Hang-up timeout 20 S39 Current flow control setting 3 S43 Current DCE speed 0 S46 Protocol/Compression selection 2 S48 Feature negotiation action S49 ASB Buffer low limit S0 ASB Buffer high limit S82 Break select register 128 S9 Extended result code bit map 0 *The bitmapped register functions are equivalent to normal AT command modem registers. 1 Stored in NVRAM with &W command 6

7 PACKAGE PIN DESIGNATIONS (Top View) 3M2910L-IG Controller 100-Lead QFP VPD CLK1OUT TXD RXD PTXCLK PTXD PRXCLK PRXD,1 #,1 Ä,1 VND USR10 USR11 USR12 USR13 USR14 USR1 USR16 USR1 A0 VPD D D6 D D4 D3 D2 D1 D0 ALE : ' VND USR3 USR36 USR3 USR34 USR33 USR32 A1 A2 A3 A4 A A6 A A8 A9 A10 A11 A12 A13 A14 A1 36(1 RESET VND OSCOUT OSCIN CLK2OUT USR0 USR1 USR31 USR30 USR40 USR41 USR42 USR43 USR44 USR4 USR46 USR4 VND VPD USR20 USR21 USR22 USR23 USR24 USR2 USR26 USR

8 PACKAGE PIN DESIGNATIONS (continued) (Top View) CAUTION: Use handling procedures necessary for a static sensitive component. AD0 XTL2 XTL1 CLK GND RXA VREF AD RESET AD ISET AD3 23 RXCLK AD RXD AD 9 21 TXD AD &6 AD ALE : ' VDD TXA,1 TXCLK 3K224L-28IH or 3K324L-28IH Single Chip Modem 28-Pin PLCC EXCLK ORDERING INFORMATION PART DESCRIPTION ORDER NUMBER PACKAGING MARK 3D2248 Surface Mount Packages 3K224L-IH/3M2910L-IG 3D2248 3K224L-28IH/3M2910L-IG 3D2348 Surface Mount Packages 3K324L-IH/3M2910L-IG 3D2348 3K324L-28IH/3M2910L-IG No responsibility is assumed by TDK Semiconductor Corporation for use of this product nor for any infringements of patents and trademarks or other rights of third parties resulting from its use. No license is granted under any patents, patent rights or trademarks of TDK Semiconductor Corporation and the company reserves the right to make changes in specifications at any time without notice. Accordingly, the reader is cautioned to verify that you are referencing the most current data sheet before placing orders. To do so, see our web site at or contact your local TDK Semiconductor representative. Copyright Notice: The software contained within certain components of the 3D2248A/2348A is copyright protected and may only be used in conjunction with the 3D2248A/2348A product as supplied by TDK Semiconductor Corporation. No license to reproduce this software is granted or implied. This material may not be reproduced in any form without the express written permission of TDK Semiconductor Corporation. Copyright All rights reserved. TDK Semiconductor Corp., 2642 Michelle Dr., Tustin, CA 9280, (14) , FAX (14) 08-88, Protected by the following patents: (4,,43) (4,89,99) (4,80,30) (4,84,868) (4,866,39) 1992 TDK Semiconductor Corporation 01/09/99- rev.c 8